Flexible Fluororesin Piston for Corrosive Pump Durability

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Solution Overview

Problem

Conventional fluororesin pistons used in pumps for corrosive liquids lack flexibility, leading to deflections, cracks, and reduced durability, which affects the constant flow rate and liquid displacement performance, and prolongs the washing process of the pump pressure chamber.

Innovation Solution

A piston with a cylindrical outer peripheral portion of 1 mm or less thickness, formed by fluororesin, featuring a flexible design with a 180-degree folded-back portion and a flange portion, ensuring close contact with the cylinder faces to prevent deflections and enhance durability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a piston is made of fluororesin to resist corrosive liquids, then corrosion resistance is improved, but flexibility deteriorates causing deflections and cracks

Engineering Contradiction:

Improvecorrosion resistanceVSAvoidflexibility

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The patent applies this principle by reducing the thickness of the cylindrical outer peripheral portion to 1 mm or less, transforming the rigid fluororesin structure into a flexible thin-walled component that can roll smoothly in the gap between the piston support member and cylinder inner face without producing deflections or bends

Inventive Principle:

Principle #30Flexible shells and thin films

Solution Approach 2:

The patent applies this principle by changing the thickness parameter of the cylindrical outer peripheral portion to 1 mm or less, which fundamentally alters the mechanical properties of the fluororesin piston from rigid to flexible, enabling it to withstand corrosive liquids while maintaining the ability to roll smoothly

Inventive Principle:

Principle #35Parameter changes

2Strength

If the cylindrical outer peripheral portion is made thick for durability, then strength is improved, but flexibility deteriorates causing inability to roll smoothly

Engineering Contradiction:

ImprovedurabilityVSAvoidrolling smoothness

Core Design Contradiction:

StrengthVSEase of operation

Solution Approach 1:

The patent applies this principle by using a thin-walled cylindrical outer peripheral portion with thickness of 1 mm or less, which acts as a flexible shell that can deform and roll smoothly in the gap between the piston support member and cylinder, while still providing sufficient structural integrity

Inventive Principle:

Principle #30Flexible shells and thin films

Solution Approach 2:

The patent applies this principle by ensuring the cylindrical outer peripheral portion maintains a circular cross-section with appropriate curvature radius, enabling it to roll smoothly without angular deflections or bends during reciprocating motion

Inventive Principle:

Principle #14Spheroidality (Curvature)

3Ease of operation

If the piston is made flexible to roll smoothly, then rolling performance is improved, but structural stability deteriorates causing deflections and bends

Engineering Contradiction:

Improverolling performanceVSAvoidstructural stability

Core Design Contradiction:

Ease of operationVSStability of the object's composition

Solution Approach 1:

The patent applies this principle by designing the cylindrical outer peripheral portion as a thin-walled flexible structure with thickness of 1 mm or less, which can deform elastically to roll smoothly while maintaining overall structural stability through proper geometric design

Inventive Principle:

Principle #30Flexible shells and thin films

Solution Approach 2:

The patent applies this principle by combining fluororesin material properties with optimized geometric structure (thin walls with circular cross-section), creating a composite system that achieves both flexibility for smooth rolling and stability to prevent deflections and bends

Inventive Principle:

Principle #40Composite materials

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The flexible design allows smooth rolling without bends, improving the piston's durability and the pump's constant flow rate and liquid displacement performance, while shortening the washing time of the pressure chamber.

Implementation Method 1

the cylindrical outer peripheral portion of the piston rolls in the gap between the outer face of the piston support member and the inner face of the cylinder in accordance with the reciprocal movement of the piston support member

Methodology Applied

Scientific EffectRolling:

Data Source

PatentUS7614338B2Piston, method of producing the piston, and pump having the piston

Publication Date: 2009.11.10 PILLAR CORP

AI summary

A piston 1 which is to be movably supported in a cylinder 11 of a pump 10 to be reciprocally driven is formed by a fluororesin so that it is not impaired by a corrosive liquid. A cylindrical outer peripheral portion 2 of the piston 1 has a thickness of 1 mm or less, and is flexible. The outer peripheral portion has a flange portion 7 in an open end portion via an approximately 180-degree folded-back portion 3. The flange portion 7 is attached to the cylinder 11. When the pump 10 is driven, the cylindrical outer peripheral portion 2 of the piston 1 smoothly rolls without producing deflections or bends in a gap between the outer peripheral face of a piston support member 15 and the inner peripheral face of the cylinder 11, while being in close contact with the two faces.